1913] HOW E—ALASKAN LICHENS 409 
(“rugoso-reticulato celluloso albo subvirescente”’ Ach.) when he 
(Bryol. 13:26. 1910) made the forma cavernosa (Menzies) Merr. 
(reticulate-lacunose-cellulose ”—“‘ whitish-cinereous” Merr.). The 
less lacunose virescent examples with perforate apothecia, common 
in the eastern states, were named by TucKERMAN as the variety 

Fic. 2.—The Linnean type of Lichen nivalis preserved at London 
ailantica (Tuck.) Nyl. It is, in view of the true type, a well 
marked variety, which has been lost sight of lately. Platysma 
slaucum (L.) Nyl. is never lacunose-reticulate above, always nitidous 
below, and the margins are always crisped. 
30. PrLatysMA (CETRARIA) GLAUCUM var. stenophyllum 
(Tuck.), comb. nov.—Ketchikan, May 27, 1911. The margins of 
